2700 baud wireless packet modem


Frequency:433.92 MHz

The CPX2s a 2,700 baud half-duplex serial radio packet modem module operating on licence-exempt European 433.05-434.79MHz SRD band. CPX2 is an intermediate level OEM radio modem which is in between a raw FSK radio module like BiM2G and a sophisticated OEM radio modem like RPM2A. It takes care of preamble, frame synchronisation and error checking.


  • Conforms to EN 300 220-2 and EN 301 489-3
  • SAW front-end filter
  • Small size
  • Low cost
  • Direct interface to microcontroller UART
  • Serial modem baud rate at 2,700bps (half-duplex)
  • 200m line of sight operating range


  • Home/Industrial Automation
  • Vehicle Sensor Monitoring
  • Telemetry
  • Data Logging Systems
  • Security Systems for Home/Industrial
  • In-building environmental monitoring and control
  • Sports and Performance Monitoring

Technical Summary

  • Operating frequency: 433.92MHz (default)
  • Modulation: 2.7kbps NRZ FSK
  • UART interface: 57,600bps, 8 data bits, Parity None, Flow Control None
  • Supply: 3.3V at 23mA transmit, 13mA receive and <2mA standby
  • Transmit power: +3dBm (2mW)
  • Receiver sensitivity: -105dBm (for 0.1% data error)
  • 32 byte data buffer
  • 40 x 14 x 5mm